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Finding the Fourth Proportional to 138,415.80, 191,013.81 and 74,753.61

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Solution

The fourth proportional to 138,415.80, 191,013.81 and 74,753.61 is: 103,159.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,415.80 : 191,013.81 = 74,753.61 : x
  2. Step 2: Convert to fraction form
    138,415.80/191,013.81 = 74,753.61/x
  3. Step 3: Cross multiply
    138,415.80x = 191,013.81 × 74,753.61
  4. Step 4: Simplify right side
    138,415.80x = 14,278,971,857.35
  5. Step 5: Solve for x
    x = 14,278,971,857.35/138,415.80
  6. Step 6: Final answer
    x = 103,159.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.